01 - In a medium bowl, mix creamy peanut butter and powdered sugar with fork until crumbly. Set aside for later use.
02 - Spread half of prepared peanut butter crumbs evenly across bottom of baked pie crust.
03 - In saucepan, whisk together granulated sugar, flour, and salt until well blended. Gradually whisk in milk until smooth and lump-free.
04 - Place saucepan over medium heat. Cook whisking constantly until mixture thickens and just begins to boil, approximately 4–5 minutes.
05 - Whisk egg yolks in separate bowl. Gradually whisk small amount of hot milk mixture into yolks to temper, stirring constantly.
06 - Slowly pour tempered egg mixture back into saucepan, whisking continuously. Cook 2 additional minutes until thick and glossy.
07 - Remove from heat. Stir in butter and vanilla extract until completely smooth and incorporated.
08 - Pour filling over peanut butter crumbs in pie shell. Cool 15 minutes at room temperature, then refrigerate minimum 2 hours until fully set.
09 - Beat heavy cream, powdered sugar, and vanilla extract until stiff peaks form. Spread evenly over chilled pie surface.
10 - Sprinkle remaining peanut butter crumbs generously over whipped topping before serving.